Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Lattice length for Zincblende structures

  1. Sep 1, 2011 #1
    So we have the covalent Radii of Ga = 1.26 A and As = 1.19 A. And the structure is Zinc blende with arsenic occupying half of the tetrahedral sites. So its probably not close packed....

    The formula the works for me is, [4/sqrt(3)] x [ radius of Ga + radius of As ]. I can get the answer ( 5.66 A ) by this but I dont know why or how it works? Can someone please explain the reasoning behind it.

    Also I noticed this is like the formula for the Body centre cubic packing. Is there any corelation?
  2. jcsd
  3. Sep 2, 2011 #2


    User Avatar

    Staff: Mentor

    Without looking at the structure - such things can be always calculated just by simple geometry. Draw the cell, assume atoms "touch" each other, draw distances between atom centers, use whatever is needed to solve the triangles present.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook